Workpiece scarfing device

ABSTRACT

A device made up of a set of blocks. Each block comprises a gascutting unit with an upper portion against which butts a gasdistributing unit, incorporating an oxygen and combustible gas chambers fitted with cut-off diaphragm valves. Mounted on a cover of the gas-distributing unit is a gasregulating unit intended for actuating each valve individually.

United States Patent 1 Daiker et a].

May 1, 1973 WORKPIECE SCARFING DEVICE Inventors: Artur Lvovich Daiker,ulitsa B. Kh-

melnitskogo, 27, kv. l4; Alexandr Nikolaevich Morozov, prospekt Lenina,74, kv. 25; Anatoly Ivanovich Veis, ulitsa Vorovskogo 9, kv. 77; BorisGrigorievich Kushtuev, ulitsa Degtyareva, 37, kv. 8; NikolaiMikhailovich Novoselov, ulitsa Degtyareva, 89, kv. 58; ViktorNikolaevich Zhuravlev, ulitsa Kalinina, 19, kv. 107; Alexei FedorovichZinoviev, ulitsa B. Khemlnitskogo, 9, kv. 85, all of Chelyabinsk; IvanIvanovich Alfeev, ulitsa Kalinina, 3, kv. 66, Magnitogorsk; ViktorIvanovich Nikitin, ulitsa P. Kalmykova, l6, kv. 58, Chelyabinsk; Alexeillich Kochergin, Teatralny pereulok, 4, kv. 24, Chelyabinsk; VladimirFilippovich Matashkov, ulitsa Ya. Gasheka, 18, kv. l3, Chelyabinsk;Nikolai lvanovich Karelin, ulitsa Lipetskaya, 23, kv. l6, Chelyabinsk;Jury Venediktovich Volchematiev, ulitsa l Sputnika, 27, kv. 55,Chelyabinsk; Veniamin Fedorovich Zaluzhentsev, ulitsa Degtyareva, 37,kv. 6, Chelyabinsk; Gennady Yakovlevich Morozov, I ulitsaKommunisticheskaya, 6a, kv. 67, Chelyabinsk, all of U.S.S.R.

Primary Examiner-Gerald A. Dost Attorney-Holman & Stern [5 7] ABSTRACT Adevice made up ofa set of blocks. Each block comprises a gas-cuttingunit with an upper portion against which butts a gas-distributing unit,incorporating an oxygen and combustible gas chambers fitted with cutoffdiaphragm valves.

Mounted on a cover of the gas-distributing unit is a gas-regulating unitintended for actuating each valve individually.

3 Claims, 6 Drawing Figures PATENTEDHAY 1 I875 SHEET 3 OF 3 D D DKJCDEJEJ D DE C The present invention relates to metallurgy and moreparticularly to devices for scarfing workpieces.

Widely known is a workpiece scarfing device incorporating: agas-distributing unit comprising several chambers through which workinggases are supplied and a number of conduits which serve to connect thechambers with appropriate cavities of gas-cutting units (scarfingtorches), secured to a lower part of the gasdistributing unit. Surfaceremoval width is controlled by a gas-regulating unit fastened on a planesurface of the gas-distributing unit and made up of pistons enclosed inthe chambers of the said gas-distributing unit, with the pistonsmanipulated by screw or rack and pinion devices driven by electric orpneumatic power. Also known is a device for stepless regulation of thewidth of the surface removal, which is executed by shutting off theconduits running to the gas-cutting unit with the aid of a flexiblegastight band.

Conventional devices, comprising a scarfing head with gas-distributingunits, do not provide for rapid readjustment of the devices in changingsizes of the workpieces, which along with heavy weight and large overalldimensions tend to increase the sizes of scarfing facilities, complicatethe arrangement of. equipment and hoses and hamper their maintenance.The conventional devices are not standardized; they are produced of anintegral blank up to 2 m long in which is drilled a multiplicity ofconduits having a small diameter and running all along its length. Inthe known scarfing devices remote position indicators of a piston groupof the gas-distributing units are unreliable under the combined actionof high temperatures, humidity and aggressive gaseous medium, whilefrequent displacement of the pistons within the distributing chamberswithout lubrication results in piston packing wear. The orthodox devicesare not applicable to machines for selective metal scarfing.

It is an object of the present invention to develop a workpiece scarfingdevice which would ensure high production rates by reducing timerequirements for readjustment in case of a change in dimensions of theworkpiece being scarfed.

According to the specified and other objects in a workpiece scarfingdevice, comprising a gas-distributing unit with a lower part againstwhich butts a gascutting unit fitted with an oxygen jet and those forsupplying combustible gas and supplementary oxygen, with-the latterformed by corrugations of zigzag walls positioned on both sides of theoxygen jet, and a gas regulating unit, conforming to this invention thesaid gas-distributing, -cutting and -regulating units are interlocked ina single block with at least two such blocks being incorporated in eachdevice and with the gas-distributing unit of each block having an oxygenand a combustible gas chamber located under a common cover andaccommodating a similar number of cut-off diaphragm valves,communicating via passages with appropriate torches or jets of thegas-cutting unit, and with the gas-regulating unit of each block mountedon the cover of the said gas-distributing unit and arranged to actuateeach valve individually.

According to this invention the gas-regulating unit is sectinalized witheach section subdivided by a membrane into a lower and an upper chamberwith the lower chamber enclosing a jet with a spring-biased baffleinteracting with the said membrane and communicating via passages withtwo corresponding cut-off diaphragm valves of the gas-distributing unit:with the valve positioned in the oxygen chamber and with that located inthe combustible gas chamber; the gas-regulating unit is also fitted witha baffle unblocking bellow and its upper chamber has pressuretransducerd in communication with each other and set up on lateral facesof two adjacent blocks, and is furnished with two bellows, one of whichencloses the other one and which are designed for interlocking andholding the baffle of the lower chamber through the said membrane.

With the above conceptual design a higher production rate can beprovided by reducing device readjustment time in case ofa change inworkpiece dimensions; it enables also the scarfing front to becontrolled automatically and makes it possible to carry out theselective scarfing of workpieces by the application of an automaticcycle. In compliance with the present invention a modified version onthe gas-regulating unit of the proposed device is also possible, i.e.:with the gas-regulating unit of each block furnished with an aircylinder coupled by a multichannel hose with respective cut-offdiaphragm valves of the gas-regulating unit, with a piston of the saidair cylinder being articulated with former bars set up on a roll tableand intended to direct the workpiece to a scarfing position, which willpermit the surface removal width to be modified under automatic andremote control. 1

The invention will be better understood from a description of anexemplary embodiment of this invention to be considered with referenceto the appended drawings, in which:

FIG. I is a layout of a device, conforming to the invention, showing thearrangement of various units;

FIG. 2 same, a longitudinal sectional view;

, FIG. 3 shows a layout of the device, conforming to the invention, witha modified version of the gas-regulating unit;

FIG. 4 same, a longitudinal sectional view;

FIG. 5 depicts jets, a view along arrow A of FIG.2;

FIG. 6 shows an automatic control circuit of the device conforming tothis invention.

A workpiece scarfing device comprises a gas-cutting I (FIG. I), agas-distributing 2 and a gas-regulating unit 3, all interlocked to forma single block 4. The device can be made up of several such blocks 4.

Gas-distributing unit 2 of block 4 is enclosed in a housing andcomprises oxygen chamber 5 (F IG.2) and combustible gas chamber 6 intowhich both the oxygen and gas are fed from below through arm 7.

Both chambers 5 and 6 are enclosed on the top with cover 8. Chambers 5and 6 communicate through drillings 9 and I0 with gas-cutting unit I,butting against a lower part of gas-distributing unit 2. Drillings 9 and10 are closed by cut-off diaphragm valves 1 1 located in equal number inchambers 5 and 6.

Valves II comprise jet I2 and diaphragm I3 secured between the housingof gas-regulating unit 2 and cover 8.

The gas-regulating unit is mounted on cover 8 and incorporates asectionalized housing with each section comprising lower I4 and upper ISplates with chambers I6 and I, separated by membrane I5 Lower chamber l7accommodates jet l9 with baffle 20 fitted with back-moving spring 21 andbellow 22 for unblocking baffle 20. Upper chamber I6 contains twobellows, one enclosed into another, of which internal bellow 23 isintended for holding baffle 20 in a lower position, whereas externalbellow 24 is designed for interlocking same baffle 20.

Jet I9 of lower chamber I7 in each section of gasregulating unit 3 isconnected via passages with two cut-off diaphragm valves II ofgas-distributing unit 2, one of which is enclosed in chamber 5 andanother in chamber 6.

Mounted on lateral faces of gas-regulating units 3 of the adjacentblocks are four pneumatic transducers 25 which send a signal into upperchamber I6 via hole 26.

Another modified version of gas-regulating unit 3 of either block isalso feasible.

Thus gas-regulating unit 3 can incorporate air power cylinder 27 (FlG.3)set up on a roll table and accommodating piston 28 allowed to travel andhinged to former bars 29 mounted also on the roll table and designed todirect a workpiece for scarfing. One cavity of air cylinder 27 is incommunication with atmosphere, while the other one is pressurized. Bothcavities of air cylinder 27 are coupled with the aid of air multichannelhose 30 to appropriate cut-off diaphragm valves II of gas-distributingunit 2. In order to enhance reliability of gas-regulating unit 3 itwould be expedient to provide manual control of the surface removalwidth through the use of switch 31, air cylinder 32 and piston 33,positioned on a scarfer control board.

Gas-cutting unit I of each block comprises upper plate 34 (FIGS 2, 4 and5) and lower plate 35, oxygen jet 36 for feeding primary oxygen, twocorrugated zigzag partitions 37 and 38, disposed between oxygen jet 36and plates 34 and 35, and screws (not shown in the drawing) fasteningthe aforesaid members into a single block. Upper plate 34 incorporatesequalizing chambers 39 separated by the partitions and in communicationvia drilling I with oxygen chamber of gas-distributing unit 2.

The scarfing device functions as follows.

As soon as the device blocks are set up on the metal to be scarfed,pneumatic transducer 25, depending on the dimensions of the billet,being scarfed, is placed opposite one of the sections of upper chamberI6 of gasregulating unit 3 (for example, II, FIG.6); next air is fedwith the ensuring rise in pressure in chamber 16 of the section.

Membrane I8 (FIGS 2 and 6) acting on baffle pushes it downward cuttingoff jet I9. The air being constantly supplied along drilling 9 andthrottle 4l into an interior ofjet I9, the pressure progressively buildsup and acts on holding bellow 23 of baffle 20, ensuring thereby theshutting off of jet l9 throughout the interval, until an adequatepressure is built-up in the bellow cavity to unblock the baffle.Simultaneously with the pressure fed into bellow 23, a control pressureis supplied to cut-off diaphragm valves II in chambers 5 and 6 ing ofthe adjacent sections (III and so on), located beyond the limits of thescarfing zone, a signal is sent into the interior of bellows 24 ofsection III. Then baffle 20 will shut-off jet I9 actuating two coupledto it cut-off diaphragm valves II of gas-distributing unit 2. Theremaining sections are detached in a similar manner.

As the device, proposed herewith, is adjusted for a given size of theworkpiece, to be scarfed, it remains fixed until valve 42 provides anadequate pressure in the cavity of bellows 22 to unblock the baffles.

Readjustment for a new size of the workpiece, to be scarfed, is effectedin a similar way.

With the modified version of gas-regulating unit 3, when the width ofthe surface removal is controlled remotely, former bars 29, set up onthe roll table, are brought together, until they touch lateral faces ofthe workpiece to be scarfed. Coupled to former bars 29 (FIG.3) piston 28is also displaced at that, travelling in air control cylinder 27 andchanging thereby a volume of control air contained within the cylinder,with the air fed in the form of signals via multichannel air hose tocut-off diaphragm valves ll of gas-distributing unit 2 whose (valve)operation has been described hereinbeof gas-distributing unit 2, whichresults in the covering 7 of valves II. On feeding the control pressure,diaphragm l3 deflects, discontinuing the supply of a working gas togas-cutting unit I. When the control pressure is relieved, diaphragm 13goes up under the influence of the working gas and valve II will open.To ensure the closfore.

Manual and automatic control of the width of the surface removal byscarfing are similar operations with the only difference that in thefirst case piston 33 is displaced in air cylinder 32 by hand by anoperator. Remote or manual mode of operation of the device is selectedby manipulating switch 31.

Control of the surface removal width effected by gasregulating unit 3allows actuating the requisite number of cut-off diaphragm valves II ofgas-distributing unit 3. In scarfing the oxygen contained ingas-distributing unit 2I passes through a clearance between diaphragm I3and jet I2 from chamber 5 via drillings I0 into equalizing chamber 39 inupper plate 34 (FIGS 2 and 5) and then through a lattice wall into aninterior of oxygen jet 36, assuring uniform distribution of the oxygenthroughout the width of the surface being scarfed. A certain amount ofthe oxygen is diverted to zigzag partitions 37 and 38 to produce, uponmixing with a combustible gas, a heating flame. From chamber 6 thecombustible gas flows via corresponding drillings 9 to the corrugationsof zigzag partitions 37 and 38 on either side of an oxygen flow.

The use of zigzag partitions 37 and 38 permits producing alternating gasand supplementary oxygen flows, increasing their contact surfaces,ensuring better mixing and obtaining a stable, high-rate andhigh-temperature heating flame on both sides of the oxygen stream. Thatis why oxygen purity in a cuttingjet varies insignificantly with the jetlength.

The hereindescribed device, being versatile, is suited not only forcontinuous but for selective scarfing as well.

What is claimed is:

l. A workpiece scarfing device incorporating: a gascutting unit fittedwith an oxygen jet and jets for supplying combustible. gas andsupplementary oxygen, said latter jets being formed by corrugations ofzigzag walls and positioned on both sides of the oxygen jet; agasdistributing unit butting against an upper part of the saidgas-cutting unit and comprising an oxygen chamber and a combustible gaschambers, both located under a common cover; cut-off diaphragm valvesset up in equal number in the said oxygen and combustible gas chambersof said gas-distributing unit and in communication via passages withappropriate jets of the said gascutting unit; a gas-regulating unitmounted on the said cover of the said gas-distributing unit and designedfor actuating individually each cut-off diaphragm valve of the saidgas-distributing unit; the said gas-cutting, gasdistributing andgas-regulating units being interlocked to form a single block with atleast two such blocks incorporated in the device.

2. A device of claim 1, in which the said gas-regulating unit issectionalized with each section divided with a membrane into a lower andupper chambers with the lower chamber accommodating a jet with aspringbiased baffle interacting with the said membrane, said jet beingin communication via passages with two corresponding cut-off diaphragmvalves of the said gas-distributing unit: one valve enclosed in the saidoxygen chamber and the other valve enclosed in the said combustible gaschamber; the said upper chamber being fitted with pressure transducerscommunicating with each other and mounted on lateral faces of the saidadjacent blocks; the upper chamber housing also two bellows one of whichencloses the other and which are intended for interlocking and holdingthe said baffle of the lower chamber through the said membrane 3. Adevice of claim 1, in which the said gas-regulating unit has an aircylinder coupled by a multichannel air hose with appropriate cut-offdiaphragm valves of the said gas-distributing unit; a piston of the saidair cylinder articulated with former bars set up on a roll table anddesigned to direct a workpiece for scarfing.

1. A workpiece scarfing device incorporating: a gas-cutting unit fittedwith an oxygen jet and jets for supplying combustible gas andsupplementary oxygen, said latter jets being formed by corrugations ofzigzag walls and positioned on both sides of the oxygen jet; agas-distributing unit butting against an upper part of the saidgas-cutting unit and comprising an oxygen chamber and a combustible gaschambers, both located under a common cover; cut-off diaphragm valvesset up in equal number in the said oxygen and combustible gas chambersof said gas-distributing unit and in communication via passages withappropriate jets of the said gas-cutting unit; a gas-regulating unitmounted on the said cover of the said gas-distributing unit and designedfor actuating individually each cut-off diaphragm valve of the saidgas-distributing unit; the said gas-cutting, gas-distributing andgas-regulating units being interlocked to form a single block with atleast two sucH blocks incorporated in the device.
 2. A device of claim1, in which the said gas-regulating unit is sectionalized with eachsection divided with a membrane into a lower and upper chambers with thelower chamber accommodating a jet with a spring-biased baffleinteracting with the said membrane, said jet being in communication viapassages with two corresponding cut-off diaphragm valves of the saidgas-distributing unit: one valve enclosed in the said oxygen chamber andthe other valve enclosed in the said combustible gas chamber; the saidupper chamber being fitted with pressure transducers communicating witheach other and mounted on lateral faces of the said adjacent blocks; theupper chamber housing also two bellows one of which encloses the otherand which are intended for interlocking and holding the said baffle ofthe lower chamber through the said membrane.
 3. A device of claim 1, inwhich the said gas-regulating unit has an air cylinder coupled by amultichannel air hose with appropriate cut-off diaphragm valves of thesaid gas-distributing unit; a piston of the said air cylinderarticulated with former bars set up on a roll table and designed todirect a workpiece for scarfing.